1. The template letter - acknowledges receipt of something the OP disputes they received. So that's not a good plan
2. The argument that you can ignore their claim and they can't pursue it - is out of date following https://www.supremecourt.uk/cases/docs/uksc-2013-0280-judgment.pdf
3. that the company has no right to obtain the registered keeper details - is wrong and also goes nowhere.
Its probably become obvious from my other posts, my field of work, but I can contribute more by not mentioning it too much.
It WAS you then.
You clearly know **** all about this if you think he has to reply to the parking charge company. Your link is bogus.
Do you work in a company that lies to the public and tries to steal from them on a daily basis ? By the sounds of it.